mirror of
https://github.com/ceph/ceph
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262 lines
9.3 KiB
Python
262 lines
9.3 KiB
Python
"""
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Handle clock skews in monitors.
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"""
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import logging
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import contextlib
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import ceph_manager
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import time
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import gevent
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from StringIO import StringIO
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from teuthology import misc as teuthology
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log = logging.getLogger(__name__)
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class ClockSkewCheck:
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"""
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Periodically check if there are any clock skews among the monitors in the
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quorum. By default, assume no skews are supposed to exist; that can be
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changed using the 'expect-skew' option. If 'fail-on-skew' is set to false,
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then we will always succeed and only report skews if any are found.
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This class does not spawn a thread. It assumes that, if that is indeed
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wanted, it should be done by a third party (for instance, the task using
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this class). We intend it as such in order to reuse this class if need be.
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This task accepts the following options:
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interval amount of seconds to wait in-between checks. (default: 30.0)
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max-skew maximum skew, in seconds, that is considered tolerable before
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issuing a warning. (default: 0.05)
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expect-skew 'true' or 'false', to indicate whether to expect a skew during
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the run or not. If 'true', the test will fail if no skew is
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found, and succeed if a skew is indeed found; if 'false', it's
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the other way around. (default: false)
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never-fail Don't fail the run if a skew is detected and we weren't
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expecting it, or if no skew is detected and we were expecting
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it. (default: False)
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at-least-once Runs at least once, even if we are told to stop.
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(default: True)
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at-least-once-timeout If we were told to stop but we are attempting to
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run at least once, timeout after this many seconds.
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(default: 600)
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Example:
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Expect a skew higher than 0.05 seconds, but only report it without
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failing the teuthology run.
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- mon_clock_skew_check:
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interval: 30
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max-skew: 0.05
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expect_skew: true
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never-fail: true
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"""
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def __init__(self, ctx, manager, config, logger):
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self.ctx = ctx
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self.manager = manager
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self.stopping = False
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self.logger = logger
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self.config = config
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if self.config is None:
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self.config = dict()
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self.check_interval = float(self.config.get('interval', 30.0))
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first_mon = teuthology.get_first_mon(ctx, config)
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remote = ctx.cluster.only(first_mon).remotes.keys()[0]
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proc = remote.run(
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args=[
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'sudo',
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'ceph-mon',
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'-i', first_mon[4:],
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'--show-config-value', 'mon_clock_drift_allowed'
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], stdout=StringIO(), wait=True
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)
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self.max_skew = self.config.get('max-skew', float(proc.stdout.getvalue()))
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self.expect_skew = self.config.get('expect-skew', False)
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self.never_fail = self.config.get('never-fail', False)
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self.at_least_once = self.config.get('at-least-once', True)
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self.at_least_once_timeout = self.config.get('at-least-once-timeout', 600.0)
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def info(self, x):
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"""
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locally define logger for info messages
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"""
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self.logger.info(x)
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def warn(self, x):
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"""
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locally define logger for warnings
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"""
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self.logger.warn(x)
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def debug(self, x):
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"""
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locally define logger for debug messages
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"""
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self.logger.info(x)
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self.logger.debug(x)
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def finish(self):
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"""
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Break out of the do_check loop.
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"""
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self.stopping = True
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def sleep_interval(self):
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"""
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If a sleep interval is set, sleep for that amount of time.
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"""
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if self.check_interval > 0.0:
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self.debug('sleeping for {s} seconds'.format(
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s=self.check_interval))
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time.sleep(self.check_interval)
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def print_skews(self, skews):
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"""
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Display skew values.
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"""
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total = len(skews)
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if total > 0:
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self.info('---------- found {n} skews ----------'.format(n=total))
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for mon_id, values in skews.iteritems():
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self.info('mon.{id}: {v}'.format(id=mon_id, v=values))
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self.info('-------------------------------------')
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else:
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self.info('---------- no skews were found ----------')
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def do_check(self):
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"""
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Clock skew checker. Loops until finish() is called.
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"""
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self.info('start checking for clock skews')
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skews = dict()
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ran_once = False
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started_on = None
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while not self.stopping or (self.at_least_once and not ran_once):
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if self.at_least_once and not ran_once and self.stopping:
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if started_on is None:
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self.info('kicking-off timeout (if any)')
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started_on = time.time()
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elif self.at_least_once_timeout > 0.0:
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assert time.time() - started_on < self.at_least_once_timeout, \
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'failed to obtain a timecheck before timeout expired'
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quorum_size = len(teuthology.get_mon_names(self.ctx))
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self.manager.wait_for_mon_quorum_size(quorum_size)
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health = self.manager.get_mon_health(True)
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timechecks = health['timechecks']
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clean_check = False
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if timechecks['round_status'] == 'finished':
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assert (timechecks['round'] % 2) == 0, \
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'timecheck marked as finished but round ' \
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'disagrees (r {r})'.format(
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r=timechecks['round'])
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clean_check = True
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else:
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assert timechecks['round_status'] == 'on-going', \
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'timecheck status expected \'on-going\' ' \
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'but found \'{s}\' instead'.format(
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s=timechecks['round_status'])
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if 'mons' in timechecks.keys() and len(timechecks['mons']) > 1:
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self.info('round still on-going, but there are available reports')
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else:
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self.info('no timechecks available just yet')
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self.sleep_interval()
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continue
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assert len(timechecks['mons']) > 1, \
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'there are not enough reported timechecks; ' \
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'expected > 1 found {n}'.format(n=len(timechecks['mons']))
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for check in timechecks['mons']:
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mon_skew = float(check['skew'])
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mon_health = check['health']
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mon_id = check['name']
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if abs(mon_skew) > self.max_skew:
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assert mon_health == 'HEALTH_WARN', \
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'mon.{id} health is \'{health}\' but skew {s} > max {ms}'.format(
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id=mon_id,health=mon_health,s=abs(mon_skew),ms=self.max_skew)
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log_str = 'mon.{id} with skew {s} > max {ms}'.format(
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id=mon_id,s=abs(mon_skew),ms=self.max_skew)
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""" add to skew list """
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details = check['details']
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skews[mon_id] = {'skew': mon_skew, 'details': details}
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if self.expect_skew:
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self.info('expected skew: {str}'.format(str=log_str))
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else:
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self.warn('unexpected skew: {str}'.format(str=log_str))
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if clean_check or (self.expect_skew and len(skews) > 0):
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ran_once = True
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self.print_skews(skews)
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self.sleep_interval()
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total = len(skews)
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self.print_skews(skews)
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error_str = ''
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found_error = False
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if self.expect_skew:
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if total == 0:
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error_str = 'We were expecting a skew, but none was found!'
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found_error = True
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else:
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if total > 0:
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error_str = 'We were not expecting a skew, but we did find it!'
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found_error = True
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if found_error:
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self.info(error_str)
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if not self.never_fail:
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assert False, error_str
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@contextlib.contextmanager
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def task(ctx, config):
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"""
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Use clas ClockSkewCheck to check for clock skews on the monitors.
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This task will spawn a thread running ClockSkewCheck's do_check().
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All the configuration will be directly handled by ClockSkewCheck,
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so please refer to the class documentation for further information.
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"""
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if config is None:
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config = {}
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assert isinstance(config, dict), \
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'mon_clock_skew_check task only accepts a dict for configuration'
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log.info('Beginning mon_clock_skew_check...')
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first_mon = teuthology.get_first_mon(ctx, config)
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(mon,) = ctx.cluster.only(first_mon).remotes.iterkeys()
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manager = ceph_manager.CephManager(
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mon,
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ctx=ctx,
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logger=log.getChild('ceph_manager'),
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)
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skew_check = ClockSkewCheck(ctx,
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manager, config,
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logger=log.getChild('mon_clock_skew_check'))
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skew_check_thread = gevent.spawn(skew_check.do_check)
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try:
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yield
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finally:
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log.info('joining mon_clock_skew_check')
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skew_check.finish()
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skew_check_thread.get()
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